optical brightener ob and optical brightener ob-1 are two brighteners often used in the plastics industry. both are general whitening agents for plastics. we can see from the names that the two are very similar, but what are their specific differences? let me give you an introduction below:
1. different molecular formulas
the molecular formula of optical brightener ob: c26h26n2o2s, the molecular formula of optical brightener ob-1: c28h18n2o2
optical brightener ob
2. different appearance
the appearance of fluorescent whitening agent ob is milky white powder. there are two kinds of fluorescent whitening agent ob-1, one is ob-1 yellow and the other is ob-1 green. the color of ob-1 yellow is blue-violet light, and the color of ob-1 green is the color light is blue light, and ob-1 green is mostly used in the plastic industry.
optical brightener ob-1
3. different melting points
the melting point of optical brightener ob is 196-205°c, and the melting point of optical brightener ob-1 is 355-360°c. ob-1 is the most high-temperature resistant of all whitening agents.
4. dispersion and stability: ob>ob-1
here, let me first explain that good dispersion means that the product is easier to dissolve and evenly dissolve. for example, paints and inks have very high requirements for the dispersion of fluorescent whitening agents; good stability means that the product is not prone to migration and yellowing in the later period. for example, some low-quality shoe soles were white and clean when they were first bought, but soon turned yellow and discolored. this shows that the stability of the fluorescent whitening agent is poor.
of course, i am not saying that the dispersion and stability of optical brightener ob-1 are not good, but it is slightly worse than ob. because of this difference, lianda chemical generally does not recommend using the fluorescent whitening agent ob-1 in inks, coatings and soft plastics. relatively speaking, ob has better dispersion and weather resistance, and is less prone to yellowing and migration. .
5. price is the biggest difference between ob and ob-1
in fact, the biggest difference between optical brightener ob and ob-1 is the price. the editor remembers that 5 years ago, the prices of fluorescent whitening agents ob and ob-1 were about the same. however, due to environmental protection rectification, there was a problem with the supply of raw materials for ob, so that the price of ob increased sharply, and ob was twice as expensive as ob-1. it is estimated that it may rise even more. because of the huge price difference, customers who can use the fluorescent whitening agent ob-1 should try to choose ob-1. customers with special requirements, such as high-end inks, coatings and soft plastics, are recommended to use ob.
6. usage
fluorescent whitening agent ob can be used to whiten and brighten thermoplastic plastics, such as pvc, pe, pp, abs, ps and other plastic products. it has excellent heat resistance and relatively good light resistance. it can also be used to whiten some fibers, paints, coatings, high-end photo papers, inks, or make anti-counterfeiting marks. it has the best light transmittance, dispersion and weather resistance, and has a significant effect on brightening transparent plastics.
fluorescent whitening agent ob-1 is a new variety developed abroad. it is suitable for whitening and brightening plastics such as pe, pvc, abs, and pc. low dosage, strong adaptability and good dispersion. it can be added during post-processing or polymerization. the whitened material has high whiteness and excellent heat resistance and weather resistance. ob-1 can also be made into slurry for textile whitening.
the above are the specific differences between whitening agents ob and ob-1. which whitening agent is suitable for your product needs to be tested before making a decision. the production process of the product is different, and the choice of whitening agent is also different.